.box {
  width: calc(5% - 10em);
  height: 100px;
  color: rgb(255, 255, 255, 0.5);
  background-color: rgba(255 255 255/0.5);
}

/* some comments */
.boxContent {
  width: 80px;
}

#myId {
  background-color: radial-gradient(red, green, blue);
}
